Power bank



FIG. 1 is a right perspective view of a power bank showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and

FIG. 7 is a bottom view thereof.

FIG. 8 is a right perspective view of another embodiment of a power bank showing our new design;

FIG. 9 is a front view thereof;

FIG. 10 is a rear view thereof;

FIG. 11 is a left side view thereof;

FIG. 12 is a right side view thereof;

FIG. 13 is a top view thereof; and

FIG. 14 is a bottom view thereof.

FIG. 15 is a right perspective view of another embodiment of a power bank showing our new design;

FIG. 16 is a front view thereof;

FIG. 17 is a rear view thereof;

FIG. 18 is a left side view thereof;

FIG. 19 is a right side view thereof;

FIG. 20 is a top view thereof; and,

FIG. 21 is a bottom view thereof.

The broken lines in the drawings depict portions of the power bank that form no part of the claimed design. The portions including surface shading represent contour and not surface ornamentation. 

CLAIM The ornamental design for a power bank, as shown and described. 